小编coc*_*oco的帖子

我是java的新手.我现在面临问题.我的目的是把时间放在文本字段中.我需要按"开始"按钮,然后时间将开始.但是在编译完这段代码之后.它有错误.我不知道这样做.有谁能够帮我？感谢大家!!

错误

I:\PlayScene.java:108: cannot find symbol
symbol: variable buttonPlay
                buttonPlay.setText(Play);
                ^
I:\PlayScene.java:111: cannot find symbol
symbol: variable buttonPlay
                buttonPlay.setText(Pause);
                ^
I:\PlayScene.java:103: cannot find symbol
symbol  : variable buttonPlay
location: class PlayScene
    buttonPlay.addActionListener(new ActionListener() {
    ^
3 errors

码

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Timer.*;
import java.util.*;
import javax.swing.Timer;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.concurrent.TimeUnit;

public class PlayScene extends JFrame implements ActionListener{

//declaration for time 
private static final String Play = "Play";
private static final String Pause = "Pause"; …